| 锶掺杂对La1-xSrxNbO4-σ质子导体性能的影响 |
| Investigation on Effect of Sr Doping on Properties of Protonic Conductor La1-xSrxNbO4-σ |
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| 摘要: 利用高温固相反应法制备了Sr掺杂LaNbO4质子导体La1-xSrxNbO4-σ（0≤x≤0.02），并且对其性能进行了表征。XRD分析表明，所有的样品具有单斜结构，晶胞体积随Sr掺杂量的增加而增大；La1-xSrxNbO4-σ样品在沸水中和二氧化碳气氛中具有很好的化学稳定性。SEM分析表明，La1-xSrxNbO4-σ粉体经1500℃烧结8h后均得到致密的、晶粒均匀的样品；Sr的掺杂抑制了陶瓷体裂缝的产生和晶粒的过度增长；随Sr的掺杂量增加，晶粒变小。交流阻抗谱分析表明，Sr掺杂改变了LaNbO4的电导率，其中样品La0.995Sr0.005NbO4-σ具有最高的电导率；样品在25℃水汽饱和的5%H2-Ar气氛下的电导率明显高于干燥空气气氛，在800℃时，La0.995Sr0.005NbO4-σ电导率达到0.003S·cm-1，电导活化能为0.44eV。 |
| 关键词: LaNbO4 Sr掺杂 质子导体 电导率 化学稳定性 |
| 基金项目: 国家自然科学基金（No.50772030，50972038，51272067）；河北省自然基金（No.E2011209036，E2012209018）资助项目。 |
| Abstract: The proton conductors La1-xSrxNbO4-σ (0≤x≤0.02) are synthesized by solid-state reaction and their properties are characterized. XRDanalysis shows that all composition samples are monoclinic structure; with an increase in Sr doped amount, cell volume becomes big; La1-xSrxNbO4-σ samples display excellent chemical stability in boiling water and carbon dioxide atmosphere. SEManalysis shows that after the La1-xSrxNbO4-σ powders are sintered at 1500 ℃ for 8 h in air, dense samples with uniform crystalline size are obtained; The Sr doping inhibits crack formation and excessive growth of crystal grain; with an increase in Sr doped amount, crystal grain size becomes small. ACimpedance spectroscopy analysis indicates that conductivities of LaNbO4 are changed by Sr doping and among all samples, La0.995Sr0.005NbO4-σ is of the highest conductivity; the conductivities of the La1-xSrxNbO4-σ samples in humid 5% H2-Ar atmosphere are much higher than that those in dry air; conductivity of La0.995Sr0.005NbO4-σ is 0.003 S·cm-1 in humid 5% H2-Ar atmosphere at 800 ℃ and its conducting activation energy is 0.44 eV. |
| Keywords: lanthanum niobium Sr-doping protonic conductor conductivity chemical stability |
| 投稿时间：2013-07-26 修订日期：2013-09-24 |
| 摘要点击次数: 1897 |
| 全文下载次数: 1264 |
| 王岭,杨学宾,周会珠,李跃华,戴磊.锶掺杂对La1-xSrxNbO4-σ质子导体性能的影响[J].无机化学学报,2014,30(2):310-316. |
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